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Dynamic Proteomic and miRNA Analysis of Polysomes from Isolated Mouse Heart After Langendorff Perfusion

Published: August 29th, 2018



1The Smidt Heart Institute, Cedars-Sinai Medical Center, 2Advanced Clinical Biosystems Research Institute, Cedars-Sinai Medical Center, 3Institute of Analytical Chemistry of the Czech Academy of Sciences

Here we present a protocol to perform polysome profiling on the isolated perfused mouse heart. We describe methods for heart perfusion, polysome profiling, and analysis of the polysome fractions with respect to mRNAs, miRNAs, and the polysome proteome.

Studies in dynamic changes in protein translation require specialized methods. Here we examined changes in newly-synthesized proteins in response to ischemia and reperfusion using the isolated perfused mouse heart coupled with polysome profiling. To further understand the dynamic changes in protein translation, we characterized the mRNAs that were loaded with cytosolic ribosomes (polyribosomes or polysomes) and also recovered mitochondrial polysomes and compared mRNA and protein distribution in the high-efficiency fractions (numerous ribosomes attached to mRNA), low-efficiency (fewer ribosomes attached) which also included mitochondrial polysomes, and the non-translating fractions. miRNAs can also associate with mRNAs that are being translated, thereby reducing the efficiency of translation, we examined the distribution of miRNAs across the fractions. The distribution of mRNAs, miRNAs, and proteins was examined under basal perfused conditions, at the end of 30 min of global no-flow ischemia, and after 30 min of reperfusion. Here we present the methods used to accomplish this analysis—in particular, the approach to optimization of protein extraction from the sucrose gradient, as this has not been described before—and provide some representative results.

The heart responds to the injury of ischemia (I) and reperfusion (R) in a dynamic fashion. However, there is little insight into acute changes in protein synthesis during the response. To address this, we took advantage of the well-established method of polysome profiling1 to identify changes in protein abundance that reflect redistribution of ribosomes and translational regulatory factors from cytosol to polysomes, and the increase in newly synthesized proteins (NSPs). In the setting of I/R, the increase in new protein synthesis occurs in a time frame that is inconsistent with transcription of new mRNAs2; moreover, disc....

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All animal studies were performed in accordance with institutional guidelines and approved by the Institutional Animal Care and Use Committee of Cedars-Sinai Medical Center.

1. Langendorff Perfusion of Mouse Heart

  1. Langendorff perfusion of mouse heart with ischemia and reperfusion
    1. Administer intraperitoneal pentobarbital sodium 70 mg/kg to the adult mouse (8-week-old, male, C57BL6/j). Confirm deep anesthesia by lack of withdrawal to toe pinch.
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mRNA analysis
mRNA results can be expressed as a distribution of a particular mRNA in each fraction (Figure 3A); for quantification, combine polyribosomal translating fractions and compare to the non-translating fraction (Figure 3B), presenting a ratio of mRNA abundance in translating to nontranslating fractions. Additional information is gained by examining the high efficiency polysome fractions separately from lo.......

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Polysome profile analysis allows for the study of protein translation by analyzing the translational state of a specific mRNA or the whole transcriptome6,7. It is also of great help when local translation needs to be studied such as synaptosomes8. Traditionally, this method involves the separation of mono- and polyribosomes and the associated mRNAs on a sucrose gradient which could be coupled with genomic or proteomic techniques to obtain .......

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NIH P01 HL112730 (RAG, JVE), NIH R01 HL132075 (RAG, JVE), Barbra Streisand Women's Heart Center (RAG, JVE), Dorothy and E. Phillip Lyon Chair in Molecular Cardiology (RAG), Erika Glazer Endowed Chair in Woman's Heart Health (JVE) and Czech Academy of Sciences Institutional Support RVO: 68081715 (MS).


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Name Company Catalog Number Comments
Pentobarbital Vortech Phamaceuticals 9373 for euthansia
Heparin Sagent 103424 used in langendorff preparation
forceps Fine Science Tools 91110-10 used to hang the heart
Langendorff system Radnoti + home made n/a A 'four heart' system consisting of custom blown glass, tubing and water baths
NaCl Sigma S7653-5KG Krebs buffer and Sucrose gradient
KCl Sigma P5405 Krebs buffer and Lysis buffer
KH2PO4 Sigma P-5504 Krebs buffer
MgSO4 Sigma M7774-500G Krebs buffer
Glucose Sigma G5767 Krebs buffer
CaCl2 Sigma C1016-500G Krebs buffer
Sucrose powder Sigma S0389-1KG Sucrose gradient
MgCl2 Sigma 208337 Sucrose gradient and Lysis buffer
Tris-base Sigma T1503-1KG Sucrose gradient and Lysis buffer
Xylene Cyanole Sigma X-4126 Sucrose gradient
Cycloheximide Sigma-aldrich 239763 Sucrose gradient and Lysis buffer
RNaseOUT Life Technologies C00019 RNAse inhibitor for Lysis buffer
Igepal CA-360 (NP40) Sigma I3021 Lysis buffer
Protease Inhibitor Cocktail tablets, EDTA free Roche 5056489001
Tube, Thinwall, Ultra-Clear, 13.2 mL, 14 x 89 mm Beckman Coulter 344059
Ultracentrifuge Beckman LE-80K Ultracentrifugation of the gradients
Rotor Beckman SW41 Ultracentrifugation of the gradients
Biologic LP (pump) Biorad 731-8300 Fractionation of the gradients
BioFrac Biorad 741-0002 Fractionation of the gradients
Eppendorf RNA/DNA LoBind microcentrifuge tubes, 2 mL tube Sigma Z666513-100EA Gradient fraction and RNA extraction
TRIzol Reagent Life technologies AM9738 RNA extraction
Luciferase Control RNA Promega L4561 RNA extraction
Chloroform Fisher Scientific C606-4 RNA extraction
Glycogen, RNA grade Thermo Fisher Scientific R0551 RNA extraction
Isopropanol Sigma I9516 RNA extraction
Ethanol Sigma E7023-1L RNA extraction
iScript cDNA Synthesis Kit BioRad 170-8891 Reverse transcription
iTaq Universal SYBR Green Supermix BioRad 175-5122 Quantative PCR
miRNeasy Micro Kit (50) Qiagen 217084 Kit for total RNA isolation
miScript II RT Kit (50) Qiagen 218161 Kit for miRNA reverse transcription
miScript Sybr Green PCR Kit (200) Qiagen 218073 Kit for real-time PCR expression analysis of miRNAs
Centrifuge 5424R Eppendorf For centrifugation of 1.5ml or 2.0ml tubes at different temperatures. Max speed - 21130g
Centrifuge 5810R Eppendorf For real-time PCR plate centrifugation at different temperatures. Max speed - 2039g
My Cycler Thermal Cycler Bio-Rad For reverse transcription
CFX96 Real-Time System/C1000 Touch Thermal Cycler Bio-Rad For real-time PCR analysis
miRNeasy Serum/Plasma Spike-in Control Qiagen 219610 For quality control of RNA isolation
Hard-Shell 96-Well PCR Plates, low profile, thin wall, skirted, green/clear Bio-Rad HSP9641 For real-time PCR analysis
Microseal 'B' PCR Plate Sealing Film, adhesive, optical Bio-Rad MSB1001 For real-time PCR plate sealing
Research plus Single-Channel Pipette, Gray; 0.5-10 µL Eppendorf UX-24505-02 For pipetting
PIPETMAN Classic Pipets, P20 Gilson F123600G For pipetting
PIPETMAN Classic Pipets, P200 Gilson F144565 For pipetting
Rainin L-1000XLS Pipet-Lite XLS LTS Pipette 100-1000 µL Gilson 17011782 For pipetting
Glycogen, RNA grade Thermo Fisher Scientific R0551 Improves total RNA isolation efficiency
Posi-Click 1.7 mL Tubes, natural color Denville C2170 RNA isolation and storage; reagent mix
Thermal Cycling Tubes -0.2 mL Individual Caps, Standard 0.2 mL tubes with optically Denville C18098-4 (1000910) Reverse transcription reaction
Sharp 10 Precision barrier Tips Denville P1096-FR For pipetting
Sharp 20 Precision barrier Tips Denville P1121 For pipetting
Sharp 200 Precision barrier Tips Denville P1122 For pipetting
Tips LTS 1 mL Filter Rainin RT-L1000F For pipetting
miScript Primer Assay (200) Qiagen (it changes according to the miRNA) For real-time PCR analysis
Gradient Master ver 5.3 Model 108 BioComp Instruments For preparation of sucrose gradients
trichloroacetic acid Sigma Aldrich T6399
acetone Sigma Aldrich 650501
Tris hydrochloride Amresco M108
dithiothreitol Fisher Scientific BP172
iodoacetamide Gbiosciences RC-150
sequencing grade modified trypsine, porcine Promega V5111
ammonium bicarbonate BDH BDH9206
formic acid, Optima LC/MS Fisher Chemical A117
methanol, Optima LC/MS Fisher Chemical A454
acetonitrile, Optima LC/MS Fisher Chemical A996
Protein LoBind tubes 0.5 mL Eppendorf AG 22431064
Protein LoBind tubes 1.5 mL Eppendorf AG 22431081
HLB µElution plate 30 µm Oasis 186001828BA
SpeedVac concentrator Thermo Scientific Savant SPD2010
sonicator Qsonica Oasis180
centrifuge Thermo Scientific Sorvall Legend micro 21R
LC trap column PepMap 100 C18 Thermo Scientific 160454
LC separation column PepMap RSLC C18 Thermo Scientific 164536
mass spectrometer Thermo Scientific Orbitrap Elite ion trap mass spectrometer
MSConvert software ProteoWizard Toolkit
Sorcerer-SEQUEST software Sage-N Research, Inc.

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